diff --git a/README.md b/README.md
index 966188e..f29206b 100644
--- a/README.md
+++ b/README.md
@@ -96,7 +96,7 @@ Now we use `g:vim_vue_plugin_config` as the only configuration variable.
     - `value`*list*: a list of syntax name for the block.
 
         - First, only syntax files from `['$VIMRUNTIME', '$VIM/vimfiles', '$HOME/.vim']` are loaded. If none is found, then **full** syntax files (including those from plugins) will be loaded
-        - The first item of `value` will be used as default syntax when no `lang="..."` appears on the block tag. 'value' can be a string if only one.
+        - The first item of `value` will be used as default syntax when no `lang="..."` appears on the block tag. `value` can be string if only one.
         - Both Vue blocks and custom blocks are supported. 
 
 - `full_syntax`*list*: a list of syntax name whose **full** syntax files are always loaded
@@ -107,6 +107,8 @@ Now we use `g:vim_vue_plugin_config` as the only configuration variable.
 
 - `foldexpr`*0/1*: enable built-in `foldexpr` foldmethod
 
+- `init_indent`*0/1*: enable initial one tab indent inside `script/style` tags
+
 - `debug`*0/1*: echo debug messages in `messages` list
 
 > For `0/1` value, set `0` to enable or `1` to disable
diff --git a/autoload/vue.vim b/autoload/vue.vim
index 1af02b6..e95086a 100644
--- a/autoload/vue.vim
+++ b/autoload/vue.vim
@@ -39,8 +39,36 @@ endfunction
 
 function! s:CheckVersion()
   if !exists('g:vim_vue_plugin_config')
-    let message =  'Please check README.md or https://github.com/leafOfTree/vim-vue-plugin'
-    echom '['.s:name.'] '.message
+    let prev_configs = [
+          \'g:vim_vue_plugin_load_full_syntax',
+          \'g:vim_vue_plugin_use_pug',
+          \'g:vim_vue_plugin_use_coffee',
+          \'g:vim_vue_plugin_use_typescript',
+          \'g:vim_vue_plugin_use_less',
+          \'g:vim_vue_plugin_use_sass',
+          \'g:vim_vue_plugin_use_scss',
+          \'g:vim_vue_plugin_use_stylus',
+          \'g:vim_vue_plugin_has_init_indent',
+          \'g:vim_vue_plugin_highlight_vue_attr',
+          \'g:vim_vue_plugin_highlight_vue_keyword',
+          \'g:vim_vue_plugin_use_foldexpr',
+          \'g:vim_vue_plugin_custom_blocks',
+          \'g:vim_vue_plugin_debug',
+          \]
+    let has_prev_config = 0
+    for config in prev_configs
+      if exists(config)
+        let has_prev_config = 1
+        break
+      endif
+    endfor
+
+    if has_prev_config
+      let message =  'Hey, it seems that you just upgraded. Please use `g:vim_vue_plugin_config` to replace previous configs'
+      let message2 = 'For details, please check README.md ## Configuration or https://github.com/leafOfTree/vim-vue-plugin'
+      echom '['.s:name.'] '.message
+      echom '['.s:name.'] '.message2
+    endif
   endif
 endfunction
 
diff --git a/indent/vue.vim b/indent/vue.vim
index 50d8072..668b654 100644
--- a/indent/vue.vim
+++ b/indent/vue.vim
@@ -1,3 +1,7 @@
+" Language: Vue
+" Maintainer: leaf <https://github.com/leafOfTree>
+" CREDITS: Inspired by mxw/vim-jsx.
+
 if exists('b:did_indent') | finish |endif
 
 function! s:Init()
diff --git a/syntax/vue.vim b/syntax/vue.vim
index 73a0b2f..62e8e74 100644
--- a/syntax/vue.vim
+++ b/syntax/vue.vim
@@ -1,3 +1,7 @@
+" Language: Vue
+" Maintainer: leaf <https://github.com/leafOfTree>
+" CREDITS: Inspired by mxw/vim-jsx.
+
 if exists('b:current_syntax') && b:current_syntax == 'vue'
   finish
 endif